Yep, I've used gorilla snot as well, also have used rubber cement and Black RTV (Black RTV is the only kind of silicone I use on anything, after trying everything known to man on the race cars, it's the stickiest for sure) all of the above have worked good for me. This is always a much greater concern when using a aluminum valve cover instead of the stock tin one, the aluminum one don't retain the gaskets near as well and much more care needs to be taken.